diff --git a/offlineimap.conf b/offlineimap.conf
index 8f74c68..69ede92 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -612,6 +612,8 @@ remotehost = examplehost
 #
 # Multiple fingerprints can be specified, separated by commas.
 #
+# In Windows, Microsoft uses the term "thumbprint" instead of "fingerprint".
+#
 # Fingerprints must be in hexadecimal form without leading '0x':
 # 40 hex digits like bbfe29cf97acb204591edbafe0aa8c8f914287c9.
 #